Sectional insulation block for supporting and stringing heating resistance coils



Patented Apr. 8, 1924.

UNITED STATES PATENT OFFIC.

ROBERT .'H. MACINNES, OF HAMILTON, ONTARIO, CANADA, ASSIGNOR TO D. MOORE COMPANY, LIMITED, OF HAMILTON, ONTARIO, CANADA SECTIONAL INSULATION BLOCK FOR SUPPORTING AND STRINGING HEATINGRE- SISTANCE COILS. y

Application filed May 24, 1923. Serial No. 641,266.

To all whom t may concern:

Be it known that Ronan'r H. hhclNNEs, a subject of the King of Great Britain, residing at Hamilton, in the county of lVent worth and Province of Ontario, Canada, has invented certain new and useful Improvements in Sectional lnsulation Blocks for Supporting and Stringing Heating Besistance Coils, of which the following is a specification. A

My invention relatesv to improvements in sectional insulation blocks for supporting and Stringing heating resistance .coils for ovens of electric ranges, In electric ovens where these blocks are employed, it is customary to arrange them in a plurality ot parallel spaced rows, the blocks being posi'- tioned end to end in each row, and the resistance coils being strung through the rows 'of blocks in transverse relation thereto and parallel with each other thus spanning the space between each row of blocks. The invention consists in the individual .block and essentially comprises a block having an enlarged base provided with a T groove eX- tending from the bottom surface in which is adapted to fit a correspondingly shaped guide rail, a pair of twin walls with an intervening space between and extending perpendicularly from the said base, the walls being provided with improved means for supporting and cross lacing the resistance coils.

An object is to provide improved crossA lacing means to keep one portion of the resistance coils out of Contact with another on the end rows of blocks. i

Still another object is to provide mountings for the blocks.

These, together /Wth other objects, may be attained by the construction, combination land arrangement of theI parts as will be hereinafter more fully described, illustrated in the accompanyingr drawing and pointed out in the claims hereunto appended.

i Referring to the drawing:

Figure 1 is a side elevation of two adjacent blocks being members of a row comprising a plurality of the same positioned end to end, showing the manner of cross lacing the resistance coils;

Fi'ure 2 is a top plan view of one of the blocks;

Figure 3 is an end view of one of the blocks; and,

Figure 4 is a perspective viewshowing a portion of two adjacent rows of blocks showing the Stringing and cross lacing of the resistance coils.

Similar reference characters refer to similar parts throughout the several views.

The insulation block is comprised of a base A and a pair of longitudinally disposed parallel wall's B with an intervening space betwen approximately equallng in width one of said walls. Int'o the bottom of the base A is formed a longitudinal groove 2 which is adapted to fta correspondingly shaped rail or guide 3 which are sleeved on the rail 3 end to end, as ilv lustrated in Figure 4', which retains them in proper relation eac-h with the other, and with the adjacent rows. j.

The resistance coils C are `strung through transverse holes 4 in the walls B arranged opposite to each other and aligned with those in the blocks belonging to the adjacent rows, thus permitting the. parallel arrangement of the coils. These holes are chamfered or beveled and expand inv diameter toward the lintervening space between. the walls, This leaves but a small portion of the sides of. the holes engaging the coils.

Above and below the holes 4 are formed projections or ledges 6, over some of those of which belong to the blocks in the outside or end rows, are laced the resistance coils for the purpose of returning them to the opposite end row.

There is in reality only one of the ledges 6 out of the 8 on each block-required, as well illustrated in Figure 1, but as different ledges are employed on different blocks, I provide 4 on each wall so as to render them universal and consequently interchangeable. By thus producing the blocks every block in the set can be made from one mold, and although the ledges on the blocks inthe centre rows are not used it lessens the cost` of production. It will be observed from .the drawing that the resistance coils are emitting from the outside corner ho1e 4 in a corner block isl led at an incline over the ledge above the outer hole 4 in the same wall of the same block and returned through the first adjacent hole 4 in the adjoining block, and in the same manner the other coil emitting from the other hole in the corner block is led at a decline under the ledge below the 'first hole 4 in the adjoining block and returned through the second hole 4 in the second block. In thus lacing the resistance coils the ycoils are pulled out to form straight Astrands of wire between the outside holes in the blocks in the end rows. In the centre of the blocks are formed large ventilation holes 7. These holes are bevelled on their sides and provide drafts ada tedv to iiow between the walls B to chil and therefore prevent breakage.

There has thus been produced a simple and efficient block for the purpose specified and of the class described.

Having now fully described my invention, what I claim and desire to secure by Letters Patent, is:- i

1. In a block of the class described com prising a base and a pair of upright twin walls having transverse resistance ooil strin ing holes disposed opposite each other, and edges formed on the outer side of each Wall above and below each one of said holes.

2. In a block of the class described comprising a base and a pair of parallel upright twin walls having transverse resistance coil Stringing holes disposed opposite each other, and ledges formed on the outer side of eachwall above and below each one of said holes. I

3. In a block of the class described ccmprising a base and a pair of parallel upright twin walls having transverse resistance coil stringingholesdisposed oppositeeach other,

said Eties being beveled to expand in diameter toward the intervening space between said walls, and ledges formed on the outer side of each wall above and below each one of said holes.

4. In a block of the cla described comprising a base and a pair of parallel upright twin walls having transverse resistance coil st-rin ing holes disposed opposite each other, and Ie es Aformed on the outer side of each wa l above and below each one of said holes, said wallshavinga largeeventilation hole extending from the outside to the intervening space between the two walls and bevelled on their outsides.

5. In a block of the class described a base having a longitudinal T groove formed in the bottom thereof, a pair of longitudinally disposed parallel upright twin walls extending the length of the base and having transverse resistance coil stringing holes disposed opposite each other, and ledges formed on the outer side of each wall above and below each one of said holes.

6. In a block of the cla described, a base, a pair of longitudinally disposed parallel upright twin walls extending the length of the base and having transverse resistance coil Stringing holes disposed opposite each other, and ledges formed on the outer side of each wall above and below each one of said holes.

7. In a block or" the class described, a base having a longitudinal T groove formed in the bottom thereof, and a pair of longitudinally disposed parallel upright twin walls extending the length of the base and having transverse resistance coil Stringing holes disposed opposite each other.

In testimony whereof I have aixed my signature.

ROBERT H. MACINNES. Witnesses:

H. E. HINDRY,

BPDARLE. 

